Burnt trees are pictured in the Castelfusano pine forest, near Rome, Italy, Wednesday, July 19, 2017. Wildfires have been ravaging swaths of Italy, mostly in the south, where the Coldiretti agricultural lobby says July rain levels were down 83 percent while temperatures were around 3 degrees Celsius higher. (Massimo Percossi/ANSA via AP)

Burnt trees are pictured in the Castelfusano pine forest, near Rome, Italy, Wednesday, July 19, 2017. Wildfires have been ravaging swaths of Italy, mostly in the south, where the Coldiretti agricultural lobby says July rain levels were down 83 percent while temperatures were around 3 degrees Celsius higher. (Massimo Percossi/ANSA via AP)

These Tuesday, July 18, 2017, webcam photos provided by the Yosemite Conservancy show the monolith known as Half Dome as smoke from the Ditwiler fire swirls into Yosemite Valley, from late morning to early afternoon, in Yosemite National Park, Calif. The Northern California blaze is also threatening powerlines that provide electricity to the park, officials said. The park remained open Wednesday but several roads frequented by tourists were closed. (Webcam by Yosemite Conservancy at yosemiteconservancy.org via AP)

FILE- In this Sunday, June 18, 2017, file photo, Portuguese firefighters work to stop a forest fire from reaching the village of Figueiro dos Vinhos in central Portugal. Portuguese lawmakers agreed Wednesday, July 19, 2017, on new measures to help contain the fires that race through the country's forests each summer, after one wildfire last month that killed 64 people. (AP Photo/Paulo Duarte, file)

A canadair firefighter airplane flies at dusk over the Castelfusano pine forest, near Rome, Italy, Tuesday, July 18, 2017. Wildfires have been ravaging swaths of Italy, mostly in the south, where the Coldiretti agricultural lobby says July rain levels were down 83 percent while temperatures were around 3 degrees Celsius higher. (Massimo Percossi/ANSA via AP)

Sun sets over burnt trees of the Castelfusano pine forest, near Rome, Italy, Tuesday, July 18, 2017. Wildfires have been ravaging swaths of Italy, mostly in the south, where the Coldiretti agricultural lobby says July rain levels were down 83 percent while temperatures were around 3 degrees Celsius higher. (Massimo Percossi/ANSA via AP)